Support for coordinates in via search

[t2gran]

Summary

Explain in one or two sentences what this PR achieves.

Issue

This is part of #4887 and fixes the top bullet point: #4887 (comment)

Unit tests

✅ I have added unit-test on some of the existing features witch did not have sufficent test covarage
✅ I also added module tests on the via coordinate raptor implementation
✅ I have fixed part of the broken Itinerary mapping tests

Documentation

✅ JavaDoc
✅ Transmodel API doc on via-coordinate

Changelog

✅ Should be included

Bumping the serialization version id

Not needed. There is no changes to the state of domain classes. StreetEdge is changed, but this should work ok with serialization. The enum LinkingDirection is changed, but this should not be serialized.

[codecov]

Codecov Report

Attention: Patch coverage is 74.79675% with 93 lines in your changes missing coverage. Please review.

Project coverage is 70.13%. Comparing base (caf673b) to head (7fb79a7).
Report is 72 commits behind head on dev-2.x.

Files with missing lines	Patch %	Lines
...a/service/DefaultViaCoordinateTransferFactory.java	10.20%	44 Missing ⚠️
...algorithm/mapping/RaptorPathToItineraryMapper.java	55.17%	11 Missing and 2 partials ⚠️
...anner/routing/via/model/ViaCoordinateTransfer.java	63.15%	7 Missing ⚠️
...m/raptoradapter/transit/DefaultRaptorTransfer.java	76.19%	5 Missing ⚠️
...routing/algorithm/raptoradapter/path/PathDiff.java	0.00%	4 Missing ⚠️
...pplanner/raptor/api/request/RaptorViaLocation.java	92.30%	2 Missing and 1 partial ⚠️
...planner/ext/restapi/resources/PlannerResource.java	0.00%	2 Missing ⚠️
...oradapter/transit/mappers/RaptorRequestMapper.java	90.00%	1 Missing and 1 partial ⚠️
...igure/TransferOptimizationServiceConfigurator.java	33.33%	1 Missing and 1 partial ⚠️
...entripplanner/routing/via/configure/ViaModule.java	0.00%	2 Missing ⚠️
... and 7 more

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6477      +/-   ##
=============================================
+ Coverage      70.10%   70.13%   +0.02%     
- Complexity     18270    18298      +28     
=============================================
  Files           2077     2079       +2     
  Lines          77654    77743      +89     
  Branches        7826     7822       -4     
=============================================
+ Hits           54440    54524      +84     
- Misses         20436    20454      +18     
+ Partials        2778     2765      -13     

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[miklcct]

I have just read this PR and want to add the functionality to my client for OTP 2.7.0, but the GTFS GraphQL API still says that "Coordinates are NOT supported yet." for the visit via points. Can anyone explain to me what this PR has achieved?